a mineral, bismuth telluride and sulfide, Bi 2 Te 2 S, occurring in soft-gray to black foliated masses.

1840–50; < Greek tetrádym(os) fourfold (see tetra-, didymous) + -ite1; modeled on German Tetradymit

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To tetradymite
World English Dictionary
tetradymite (tɛˈtrædɪˌmaɪt)
a grey metallic mineral consisting of a telluride and sulphide of bismuth. Formula: Bi2Te2S
[C19: from Late Greek tetradumos fourfold, from Greek tetra- + didumos double]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Encyclopedia Britannica


a sulfide mineral of bismuth and tellurium (Bi2Te2S). It is commonly found in gold-quartz veins and contact-metamorphic deposits, as in Idu, Japan; Sorata, Bolivia; Boliden, Sweden; and Boulder county, Colo., U.S. Tetradymite is classified in a group of metallike sulfide minerals closely resembling each other in physical properties and in the hexagonal symmetry of their crystals. For detailed physical properties, see sulfide mineral (table)

Learn more about tetradymite with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
Ternary tetradymite compounds as topological insulators.
Tetradymite is in the interstices of the rock-forming silicates.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature